变量Xsition的值写进一次，–般保持3个扫描期，跳变位保持相同的值3个扫描期。因而，POSCON连续不断地每隔3个扫描周期传递能流。注意:如果变量Xsition的值实际上每个扫描周期就写进一次，那么POSCON的变化就和PTCON的变化
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